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CORROSION SCIENCE · 2022 · IF 7.72

A robust calcium carbonate (CaCO3) coating on biomedical MgZnCa alloy for promising corrosion protection

Pingli Jiang,Ruiqing Hou,Shijie Zhu,Shaokang Guan

To improve the anti-corrosion property of biodegradable magnesium alloy , a CaCO 3 coating was developed by hydrothermal treatment . The prepared coatings generally consisted of three layers: a dark inner layer, a bright middle dense calcite layer and a bright outer loosely deposited CaCO 3 layer. As the electrolyte concentration increased, the formation of the inner product layer and the deposition of loose aragonite products were considerably inhibited, whereas the middle calcite layer became more intact and compact, which conferred enhanced corrosion protection upon the coated samples. Additionally, this coating showed a possible transformation into calcium phosphate during immersion.

研究领域: 材料科学 · 生物医学工程

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SEPARATION AND PURIFICATION TECHNOLOGY · 2020 · IF 5.774

CaCO3 coated nanoscale zero-valent iron (nZVI) for the removal of chromium(VI) in aqueous solution

Yujun Cheng,Haoran Dong,Tianwei Hao

In this study, calcium carbonate (CaCO 3 ) coated nanoscale zero-valent iron (referred to as C-nZVI) was successfully synthesized and used for the removal of Cr(VI) in aqueous solution. The obtained C-nZVI particles were observed to be chain-like structure of spherical particles with a smooth surface by Transmission Electron Microscope (TEM). The magnetic hysteresis loop manifested that C-nZVI (CaCO 3 /Fe = 1:4, mass ratio) was ferromagnetic and the saturation magnetization (Ms) was 115.48 emu/g, revealing that C-nZVI had favorable properties of separation, recovery and reuse. Regarding the Cr(VI) removal, no positive correlation between the removal efficiencies and CaCO 3 /Fe mass ratio increasing from CaCO 3 /Fe = 0.5:4 to 4:4. Meanwhile, complete removal of Cr(VI) was observed at initial pH = 3.0 and initial Cr(VI) concentration of 5 mg/L, and the removal efficiency gradually decreased with increasing the initial pH and initial Cr(VI) concentration. The water chemistry had a more or less influence on the reactivity of C-nZVI. Specifically, the presence of Ca 2+ and Mg 2+ facilitated the Cr(VI) removal by C-nZVI, but the PO 4 3− and humic acid (HA) impeded the reactivity of C-nZVI. NO 3 − is generally considered to have an adverse influence on nZVI, but it displayed a positive effect on C-nZVI, which should be ascribed to the promotion of C-nZVI corrosion. Additionally, C-nZVI aged for 2 d and 30 d in air had a similar removal efficiency (83.2% and 82.6%) of Cr(VI) as fresh C-nZVI (85%), whereas the Cr(VI) removal efficiency by C-nZVI aged for the same aging times in aqueous solution were approximate 65.9% and 46.6%, respectively.

研究领域: 环境科学 · 材料科学

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A robust calcium carbonate (CaCO3) coating on biomedical MgZnCa alloy for promising corrosion protection

CaCO3 coated nanoscale zero-valent iron (nZVI) for the removal of chromium(VI) in aqueous solution